<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>
<body>
    <script>
    //    小驼峰命名法
    var helloWorld="我爱小航航";
    console.log(helloWorld);
    // 大驼峰命名法
    var MyEnglishName="Sally";
    console.log(MyEnglishName);
    // 下划线，$符号命名
    var  _SomeThingAboutYou="my heart";
    console.log(_SomeThingAboutYou);
    // 数字不能写在开头
    var nu1mber="something can't change";
    console.log(nu1mber);
    // 定义多个变量
    var name,age,color;
    myname="sally";
    age="twenty-five"
    color="purple";
    console.log(myname,age,color);
    </script>
</body>
</html>